Naphthenic acids, also known as cycloalkane carboxylic acids, are organic acids present in some crude oils. They cause a specific type of corrosion called naphthenic acid corrosion (NAC), which is a major concern in oil refineries. NAC primarily occurs at high temperatures, typically between 200°C and 400°C (392°F and 752°F), in the absence of sulfur. The corrosion mechanism involves the reaction of naphthenic acids with the iron in steel, forming iron naphthenates and releasing hydro....
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